I took this screenie and then went thru each city to record the actual benefit of switching from monarchy in a very violent game (almost, but not-quite-always war)
This continent was located in the northwestern hemisphere and had no civs on it, despite the size. I was China and conquered the Egytian colonies before switching over from monarchy to democracy. This made for a turboboost to my tax revenues and my science rates. Each of my colonies, after "home rule" was established and the war-hero of the Sino-Egyptian War rush-built the Forbidden Palace, suddenly started paying for themselves.
The 13 cities on the western continent went from 14 shields of production to 53, from 20gpt in taxes paid to 177g, and from 14 beakers of research per turn to 170. Wow.
Of course after that, I had to find a peaceful way to beat the Iroquois. Stupid democratic citizens don't seem to like wars.
Spoiler :

This continent was located in the northwestern hemisphere and had no civs on it, despite the size. I was China and conquered the Egytian colonies before switching over from monarchy to democracy. This made for a turboboost to my tax revenues and my science rates. Each of my colonies, after "home rule" was established and the war-hero of the Sino-Egyptian War rush-built the Forbidden Palace, suddenly started paying for themselves.
The 13 cities on the western continent went from 14 shields of production to 53, from 20gpt in taxes paid to 177g, and from 14 beakers of research per turn to 170. Wow.
Of course after that, I had to find a peaceful way to beat the Iroquois. Stupid democratic citizens don't seem to like wars.